# This is a sample Python file
def calculate_sum(a, b):
    """Calculate the sum of two numbers"""
    result = a + b
    return result

def main():
    # Main function
    print("Hello World!")
    x = 10
    y = 20
    total = calculate_sum(x, y)
    print(f"Sum: {total}")

if __name__ == "__main__":
    main()